Abstract: A convertible placemat and carrier having a generally planar flexible sheet with a center portion for supporting an object, preferably food and beverage products. The carrier also includes a plurality of spaced-apart slits arranged in a plurality of concentric rings extending radially outward from the center portion of the sheet. The remaining portion of the sheet between the slits is interconnected to form a lattice structure. The sheet is moveable from a flat planar configuration to an expanded configuration in the form of a carrier. An object is held in the center of the sheet and handle portions are moveable upwardly away from the center portion and the sheet expands via the lattice structure to form a carrier for holding the object placed in the center portion.

Abstract: A convertible placemat and carrier having a generally planar flexible sheet with a center portion for supporting an object, preferably food and beverage products. The carrier also includes a plurality of spaced-apart slits arranged in a plurality of concentric rings extending radially outward from the center portion of the sheet. The remaining portion of the sheet between the slits is interconnected to form a lattice structure. The sheet is moveable from a flat planar configuration to an expanded configuration in the form of a carrier. An object is held in the center of the sheet and handle portions are moveable upwardly away from the center portion and the sheet expands via the lattice structure to form a carrier for holding the object placed in the center portion.

Abstract: An apparatus is provided for folding either of two size sheets of paper, such as letter and legal size paper, for insertion into an envelope. The apparatus includes a planar base and a pair of opposed structures against which a sheet of paper to be folded may be placed for positioning of the sheet. A folding bar is mountable at one several preselected positions on the base such that the sheet to be folded passes between the folding bar and the base. Preferably, a creasing bar is provided for applying pressure to a surface of the sheet to be folded causing the sheet to be pressed tightly against the folding bar such that a crease is formed across the sheet at a preselected location corresponding to the first fold of the sheet, The base and the folding bar are provided with a detent mechanism such that the folding bar may be readily, moved to the appropriate position for creation of the initial crease and the particular size of paper to be folded. A method of folding the sheets of paper is also disclosed.

Abstract: An automatic electronic reset current cut-off protection circuit for electrostatic precipitator air cleaner power supplies of the type utilizing a ferroresonant transformer having a primary winding, a secondary winding for producing relatively high voltage and a tertiary winding for producing a relatively low voltage. The circuit operates to inhibit power supply operation in the event of an overload in the ionizer or collector cell by sensing a voltage derived from the high voltage and comparing the sense voltage with a fixed reference. When the sense voltage falls below a predetermined value, current through the transformer primary is inhibited for a predetermined time. Current flow is automatically reinstated and the circuit will cyclically cause the power supply to shut down until the fault has cleared. The reference voltage is derived from the tertiary winding voltage resulting in increased sensitivity of the circuit to short duration overload conditions.

Abstract: A high voltage monitor and display for electrostatic precipitators producing a digital output code representing the magnitude of the high voltage associated with the ionizer and collecting cells which is applied to a series of display elements arranged in a spaced linear relationship such that the number of adjacent display elements illuminated corresponds to the magnitude of the high voltage to provide a visible indication of ionizer cell and collector cell performance. A predetermined minimum cell voltage is established digitally, and the high voltage power supply inhibited when the high voltage falls below the predetermined value. Alarm means are also provided for indicating when the collector cell or ionizer cell voltage is below the predetermined operating minimum.